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About the Role

We are seeking a Senior Systems Administrator to join a managed IT services provider supporting clients across the Greater Toronto Area. This is a hands-on role with a strong focus on virtualization, Microsoft 365, Azure, and networking, requiring strong infrastructure experience and client interaction skills.

Responsibilities

• Manage and troubleshoot virtualized infrastructure, including Nutanix HCI environments
• Administer and support Microsoft 365 environments, including Exchange Online, SharePoint, Teams, OneDrive, and user/license management
• Support Azure and Entra ID environments, including hybrid identity and cloud infrastructure
• Configure, maintain, and troubleshoot network infrastructure, including LAN/WAN, VLANs, firewalls, VPNs, and Wi-Fi
• Serve as a senior escalation point for complex technical issues and Level 1/2 tickets
• Support server, endpoint, operating system, and infrastructure-related issues across client environments
• Lead and support infrastructure projects, including migrations, upgrades, and implementations
• Monitor system health and proactively identify and resolve potential issues
• Maintain accurate technical documentation, network diagrams, and infrastructure standards
• Work directly with clients and vendors to resolve technical issues and deliver solutions
• Provide technical guidance and mentorship to junior technicians
• Apply security best practices across client systems and infrastructure

Requirements

• 5+ years of experience in Systems Administration, Infrastructure Engineering, or a similar role
• Experience working within an MSP, managed services, or multi-client environment
• Hands-on experience administering Nutanix HCI, including cluster management and AHV/VM administration
• Strong experience administering Microsoft 365, including Exchange Online, SharePoint, Teams, and OneDrive
• Experience with Azure and Microsoft Entra ID, including hybrid environments
• Solid understanding of networking, including LAN/WAN, VLANs, firewalls, VPNs, and routing
• Experience with Windows Server and on-premises Active Directory
• Experience with RMM and PSA platforms; HaloPSA and NinjaOne are an asset
• Strong troubleshooting and problem-solving skills
• Experience mentoring, coaching, or providing technical direction to junior technicians
• Strong client-facing communication skills and the ability to work with both technical and non-technical stakeholders
• Strong organizational skills and the ability to manage multiple client environments and competing priorities
• Cybersecurity experience from a systems/infrastructure administration perspective
• Experience with SentinelOne, Microsoft Defender, or other EDR/MDR platforms
• FortiGate or other firewall experience
• Microsoft 365 security experience, including Conditional Access, MFA, Intune, and DLP
• Experience with infrastructure migrations to Azure/Microsoft 365
• ITIL Foundation or working knowledge of ITIL practices
• Experience supporting law firms or professional services organizations
• Experience with operational technology (OT), building automation, or commercial property environments

Skills

• Nutanix HCI
• Microsoft 365
• Azure
• Entra ID
• Networking
• LAN/WAN
• VLANs
• Firewalls
• VPNs
• Wi-Fi
• Windows Server
• Active Directory
• RMM platforms
• PSA platforms
• Troubleshooting
• Problem-solving
• Client-facing communication
• Organizational skills
• Cybersecurity
• SentinelOne
• Microsoft Defender
• EDR platforms
• MDR platforms
• FortiGate
• Conditional Access
• MFA
• Intune
• DLP
• ITIL

Location

• Toronto, ON

Work Type

• Fully Onsite
• On-call
• After hours support

Experience Level

• Senior
• 5+ years

Education Level

• Nutanix certifications
• Microsoft certifications

Salary/Compensations

• $90,000 - $120,000
• Performance Bonus Eligibility

Benefits

• Paid Time Off
• Extended Health Benefits (Medical/Dental/Vision)
• Professional development, training, and certification opportunities

About the Company

• At STACK IT Recruitment, we connect top talent with standout opportunities.
• We’re committed to diversity and inclusion.

Equal Opportunity

• Need accommodation during the hiring process? Let us know, we’re here to support you!
• AI Use Disclosure: STACK IT uses AI-enhanced tools to support initial candidate screening and interview note analysis. All assessments and hiring decisions remain human-led.